Which of the following chemical groups is not used to construct a DNA molecule?
(a) five-carbon sugar
(b) phosphate
(c) nitrogen-containing base
(d) six-carbon sugar
Answer: D
Which of the following chemical groups is not used to construct a DNA molecule?
(a) five-carbon sugar
(b) phosphate
(c) nitrogen-containing base
(d) six-carbon sugar
Answer: D